gcc -DHAVE_CONFIG_H -I. -I. -I../../.. -I. -I. -I../../../include 
-I../../../include -I../../../include/orbit/orb-core 
-DORBIT_TYPELIB_DIR=\"/usr/lib/orbit\" -I/usr/include/glib-2.0 
-I/usr/lib/glib-2.0/include -I/usr/include -O2 -march=i386 -mcpu=i686 -c 
corba-typecode.c  -fPIC -DPIC -o .libs/corba-typecode.lo
cc1: warning: changing search order for system directory "/usr/include"
cc1: warning:   as it has already been specified as a non-system directory
corba-typecode.c:142: conflicting types for `TC_null_struct'
../../../include/orbit/orb-core/corba-typecode.h:51: previous declaration 
of `TC_null_struct'
corba-typecode.c:149: conflicting types for `TC_void_struct'
../../../include/orbit/orb-core/corba-typecode.h:52: previous declaration 
of `TC_void_struct'
[...]

It's a 

struct CORBA_TypeCode_struct

vs.

extern const struct CORBA_TypeCode_struct

issue (non-matching declarations). Older compilers just happened not to 
barf on it.

Also, the fact that it uses "-I/usr/include" leads to numerous compiler 
warnings.